I got some plastic film ones from B&H photo supply. I think the brand
was White Lightning, and they are designed for filtering lighting on
subjects. They are pretty good at high light intensities. B&H was just
about to run out of them, but a White Lightning search on Google might
get you what you need. If you need just a small are of filters (a few cm
squared), I can give you some.
-- Gini Berg
---------------
There is a certain madness comes over one at the mere site of a good
map. -Freya Stark, "Letters from Syria"
Dr. Virginia Berg
Professor, Plant Physiology
Biology Department
University of Northern Iowa
Cedar Falls, IA USA 50614-0421
bergv at uni.eduhttp://www.uni.edu/berg
office: 319 273-2770
fax: 319 273-2893
---